I'll say 20 million sold to consumer.

There was a photo during a montage that glimpsed by the screen as Sony announced fastest selling console to date, ever. In that photo it said 14xxxxxx but there was no actual statement that talked about it. Besides, they announced the 13.5 shipped In September. A whole two months and a week before PSX. I can't conclude from that that they had onlyjust reached 14 mil sold through during that time frame given on bf week alone they sold over a million world wide.

It must be said that 15-17M predictions were common when XBOne still was so weak and MS clueless about how to compete at the beginning of this gen that Sony could have quietly dominated maximising  profit too, without having to make price drops or too many special offers and bundles and the situation could have even allowed it to avoid boosting production until its costs had the first major reductions. But Sony domination forced MS to compete more aggressively, and this in return made Sony make more offers and bundles and increase production. To cut it short, competition increased and this benefited both PS and XB gamers.
BTW, it's quite likely that except in November, Sony will keep a large lead, but MS most reasonable goals were probably just to close at least part of the gap in USA and UK, to have an excellent November and a very good December and to boost the baseline above the previous appalling one, and it had to bite the bullet about the high probability, that actually became reality, that Sony countered its moves to boost PS4 too and keep its lead as unaffected as possible without bleeding money. Results are really excellent, well played, Sony.

I believe 20+M PS4 sold by the end of 2014.

December is the biggest month of the year, and usually sells 50% to 100% more than November.

Given sales of 2.6 Million PS4s in November, December sales are likely to be between 3.9 Million and 5.2 Million.

maybe 17 mio

It's going to sell only 400k copies over the next 4 weeks? :p Even the WiiU should do a lot more than that.

I think Sony will announce 20 Million sold through during CES.

I still think it will beat the Wii though, maybe not 21m sold through but still impressive.

It already has 16.6....